RS-232/422/485 to 10/100Base
Contents
1. MODEM INTEFNET IMTP ANET ETHERNET SWITCH ETHERNET SWITCH SEGMENT B SEGMENT A SEGMENT MEDIA CONVERT Be SEGMENT Serial cabling 1 200m max distance SEGMENT B Ethernet cabling Cat 3 4 5 5e 100m max distance Note The max distance will depend on the type and quality of the cable and the data transmission rate 472. RS 232 422 485 to 10 100Base TX Converter User s Manual COPYRIGHT All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means whether electronic mechanical photo copying recording or otherwise without the prior written permission of the publisher In FCC WARNING rl FE i This equipment has been tested and found to comply with the limits for class A device pursuant to part 15 of FCC rules These limits are designed to provide reasonable protection against harmful interference in a commercial installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communication Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at the user s own expense M CE This is a Class A product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures Take special note to read and understand all content given in the warning boxes La Warning Table of Contents Hiper mee 1 About This diari Padus 1 Feal e 2 lere cR ET 3 S 2 Hardware
3. RS 232 422 485 to 10 100Base TX Converter Product Illustrations Outline view H 154 00 100 POST View of front panel A RJ45 10 100Base TX Ethernet port View of front panel B Port LEDs D E F C Female DB9 serial port D DIP switches E Power LED F Power input 1224 i os View of rear panel IADE Sirri RS 232 422 485 to 10 100Base TX Converter 3 Installation To install your Converter please see the following procedures e Location e Desktop Installation e Powering On Unit e Connecting Copper Cables e DB9 Female Connector Pin Assignment e Serial Connection e Connection to DTE e Connection to DCE e Ethernet Connection RS 232 422 485 to 10 100Base TX Converter Location The location selected for installing the Converter may greatly affect its performance When selecting a site we recommend considering the following rules 1 Install the Converter in a fairly cool and dry place See Technical Specifications for the acceptable temperature humidity operating ranges 2 Install the Converter in a location free from strong electromagnetic field generators such as motors vibration dust direct exposure to sunlight 3 Leave at least 10cm of space at the front and rear of the unit for ventilation 4 Affix the provided rubber pads to the bottom of the Converter for grip and to protect the case from scratching
4. welcome message on screen 4 Press ENTER and on the following screen type the default username admin leave the password field blank since there is no default value and press ENTER to proceed 5 Select either CLI User Interface or Menu driven Interface option by using the associated number key or using the TAB key and pressing ENTER A Main Menu screen appears 21 RS 232 422 485 to 10 100Base TX Converter The following screen will be displayed Choose CLI key in 1 or menu driven key in 2 If menu driven is chosen the system will display the following 22 RS 232 422 485 to 10 100Base TX Converter RS 232 422 485 to 10 100Base TX Converter Main Menu Configuration Options System Information Menu From this menu the user can view some system The figure below shows the Main Menu screen From related information and default IP address The user this screen the configuration options available provide should set up appropriate IP address subnet mask the user to quickly access and adjust the media and Gateway for his own network After entering a converter settings as required new IP address Telnet and data communication will be based on the new address System Information Menu Main Menu System System Information menu 23 24 RS 232 422 485 to 10 100Base TX Converter DHCP Configuration Menu DHCP Dynamic Host Configuration Protocol allows the Converter to o
5. 3 RS 422 485 4W OFF 4 RS485 QW OF SENA e 1 6 NA OF For setting the control function of the serial port see the table below DIP1 Serial Connection RS 232 Console Data Communication NOTE 1 avoid incorrect connection please review your DTE or DCE s connector and the converter s connector pin definition before installation 2 For some RS 422 485 devices which may not be designed to provide DB 9 connection please ignore the DTE DCE mode installation procedure and check the pin definition to connect the devices 3 Forthe first time installation you have to use console mode to setup the connection configuration with RS 232 cable 14 RS 232 422 485 to 10 100Base TX Converter Connection to Data Terminal Equipment DTE 1 Ensure that DIP switch 1 is in the OFF position Disables Console mode 2 Set DIP switches 2 3 and 4 according to wire type as indicated below 3 Prepare TIA EIA 574 compliant cross over shielded cables with DB 9 connectors for RS 232 communication the others please refer to the appendix for more detailed information 4 Connect male DB 9 connector at one end of cable to converter s female DB 9 connector 5 Connect male or female DB 9 connector at other end of cable to DTE s male or female DB 9 connector 6 Dip switch 7 only support RS 422 485 mode please set it up in terms of your network configuration The defa
6. Description 6 Product Overview 6 Product Illustrations sese 7 etd vss voveo ED XL wav RUE PEE 8 A E EE 9 Desktop Installation 10 Powermod OM WAIT e 11 Connecting Copper Cable 12 DB9 Female Connector Pin Assignments 13 Serial CONMECHON etat 14 Definition of DIP Switches 14 Connection to Data Terminal 15 T E uei tct es edet gene 15 Connection to Data Communication Equipment DCE 16 Ethernet 17 A LED JndICaEOLS 0 18 5 ConlguralloDi 19 SOLL 19 HyperTerminal Configuration 20 Main Menu Configuration Options 23 System Information Menu 24 DHCP Configuration Menu 25 RS 232 Transfer and Serial Port 26 MONON MEDU See roig 29 TFTP Firmware Upgrade Menu 30 Load System 31 31 Comma
7. The default Login name is admin with no preset password After successful login type the following command line to change the device IP address in CLI mode where xxx s represent values between 0 and 254 and the user should enter their own IP address in this form e telnet XXX XXX XXX XXX 2 After entering the new IP address The system will confirm whether the operation is successful NOTE Copy the new address down on a piece of paper You will need the address when you are going to use Telnet or set up data transfer communication connections Warning IP addresses are unique If an address isn t available please contact the appropriate authorities to apply for one 3 After you log into the system you will see a welcome message on screen 33 RS 232 422 485 to 10 100Base TX Converter 4 Press ENTER and on the following screen type the default username admin leave the password field blank since there is no default value and press ENTER to proceed 5 Select CLI User Interface option by using the associated number key or using the TAB key and pressing ENTER A command prompt appears NOTE Type or help to view full list of commands and explanations 34 RS 232 422 485 to 10 100Base TX Converter Command Definitions backup Use this command to save configuration settings to file exit Type exit or logout and press ENTER to quit the program help To access help com
8. 2 BE RX In CA TX Out DE RX IN A Warning When using a RS 422 485 serial cable to connect to a device it is imperative to check for the correct pin assignment and signal direction on the terminal plugs Otherwise the transmission will fail 40 RS 232 422 485 to 10 100Base TX Converter RS 485 2 Wire Definition ee amp Female Male Media Converter RS 485 Device Warning When using a RS 485 serial cable to connect to a device it is imperative to check for the correct pin assignment and signal direction on the terminal plugs Otherwise the transmission will fail 41 RS 232 422 485 to 10 100Base TX Converter Appendix B About RJ 45 Cables When connecting your network devices use standard Category 3 eight way cables for 10Base T configurations and Category 5 cable for 100Base TX The pin assignments are as follows Pin 1 TD Pair 2 White Orange Pin 2 TD Pair 2 Orange White Pin 3 RX Pair 3 White Green Pin 4 N A Pair 1 Blue White Pin 5 N A Pair 1 White Blue Pin 6 RX Pair 3 Green White Pin 7 Pair 4 Brown White Pin 8 N A Pair 4 Brown White Application Cable Type Application Converter to Converter Straight through or Network Adapter Converter to Switch Cross Over This device featured the Auto MDI MDI X function therefore the cable types could be detected automatically 42 RS 232 422 485 to 10 100
9. Base TX Converter Appendix C Mini Converter Chassis The Mini Converter Chassis was developed to accommodate just one media converter or slide in module The Chassis provides AC or DC power and protection for converter units or modules Now network designers can plan their Ethernet Fast Ethernet ATM or Gigabit networks without having to worry about the power source Furthermore its unique sizes allows it to be installed in locations where space is limited Features e Simple and easy to install e Adds fiber connectivity to otherwise copper based networks e Supports 10 100 1000Base copper fiber single multi mode converters with RJ 45 ST SC MT RJ VF 45 LC WDM connectors e Accommodates one media converter or slide in module e Suitable for all size of networks in all locations e Provides internal AC or DC switching power supply e Made from high quality durable steel e Optional external redundant power adapter 43 RS 232 422 485 to 10 100Base TX Converter Affixing Brackets We have supplied 2 special brackets that easily attaches to the Converter This allows for the secure placement of the converter into the Chassis It also seals off the front of Chassis and allows it to function correctly Following the examples below Step 1 Using a Phillips screwdriver remove two screws from the side panels on the converter Step 2 Place the converter and brackets on a flat horizontal surface as illustrated abo
10. DIP 7 Enables disables termination TMR AC power adapter 12V DC 9 0 8A Frequency 47Hz to 63Hz Temperature Operating 0 to 50 Relative Humidity 1096 to 8096 non condensing Storage 20 C to 70 Relative Humidity 5 to 9096 non condensing Emissions FCC Part 15 of Class A amp CE approved Dimensions 109 2 x 73 8 x 23 4mm L x W x H Weight 158 grams RS 232 422 485 to 10 100Base TX Converter Package Contents The package should include the following e One media converter unit e One power adapter please check connector type and input power specification e Four self adhesive pads e Two screws for wall mount installation e Users Manual RS 232 422 485 to 10 100Base TX Converter 2 Hardware Description Product Overview The Converter features complete Ethernet and TCP IP network support that allows devices in industry with RS 232 422 485 connectors such as miling machines measurement instruments and robots to connect to LAN based automation Other devices typically found on campus networks such as card readers code readers lab equipment medical equipment and other similar serial devices can now instantly migrate to a TCP IP network Additionally by deploying the media converter users can install the device as a standalone solution or in a chassis for rack mount system thereby retaining investments made in their existing serial equipment and software
11. RS 232 422 485 to 10 100Base TX Converter Desktop Installation Follow the instructions listed below to install the Converter onto a desktop location 1 Locate the Converter in a clean flat and safe position that has easy access to AC power 2 Affix the four self adhesive rubber pads to the underside of the Converter 3 Apply AC power to the Converter The green PWR LED on the rear panel should light 4 Connect cables from the network partner devices to the ports on the front panel The green LNK LED on the front panel associated with the port should light This Converter can also be mounted on a vertical Surface Simply use the underside of the unit as a template to measure and mark out the position of the holes on to the surface where the unit is to be installed Then use the two screws provided to mount the converter firmly in place Warning Please exercise caution when using power tools Also install this unit away from damp or wet locations or in close proximity to very hot surfaces These types of environments can have a detrimental effect on the converter and cables An ideal location is a lightly cooled place such as a typical equipment room 10 RS 232 422 485 to 10 100Base TX Converter Powering On Unit The Converter uses external power supply 12V DC 0 8A 50 60 Hz 1 Insert the power cable plug directly into the receptacle located at the back of the device 2 Plug the power adapt
12. al port 36 RS 232 422 485 to 10 100Base TX Converter flow Set flow control type of serial port statistics Clear statistics upgrade Reloads configuration file or upgrade runtime firmware upgrade config Use this command to reload previously saved configurations For this operation to be successful type in the IP address and filename accurately upgrade firmware Use this command to load new versions of software for this console For example upgrade firmware Soft2 bin Warning After each configuration session be sure to set DIP switch 1 to the OFF position Otherwise the converter will not transmit any data 3 RS 232 422 485 to 10 100Base TX Converter Appendix A RS 232 Wiring Male to Female Wire DCE gt DTE w Female a Converter RS 232 Cable PC COM1 DTE DB9 Female Connection DB9 Male _ PIN 1 PIN 1 PIN 2 Em PIN 2 PIN 3 PIN 3 PIN 6 PIN 6 PIN 7 PIN 7 PIN 9 PIN 9 38 RS 232 422 485 to 10 100Base TX Converter Male to Male Wire DCE gt DCE gt Female DB9 Female Connection DB9 Male ec pa PN PINS PINS png EE gt PIN 7 PIN 9 39 RS 232 422 485 to 10 100Base TX Converter RS 422 485 Wiring RS 422 485 4 Wire Definition Female Media Converter RS 422 485 Device 2 A 1 A 5 mE ED e
13. btain an IP address from DHCP server automatically NOTE A DHCP server must exist and be available in your local network prior to enabling the DHCP client DHCP Configuration menu 25 RS 232 422 485 to 10 100Base TX Converter RS 232 Transfer and Serial Port The RS 232 Transfer menu is applicable to all RS 232 RS 422 RS 485 modes Before transferring data through a media converter it is necessary to set up a connection between the local and remote media converter The connection setup process involves the server waiting for connection service request sent by client During this process the default setting is AUTO mode wherein the system will determine which end is server and which end is client automatically NOTE If necessary the server and client can be designated manually he saved configuration i5 not eftsotive until Symstem or Power aft on RS 232 Transfer Menu amp Serial Port Configuration 26 RS 232 422 485 to 10 100Base TX Converter Warning Changes to the settings are saved to a system flash memory and do NOT take effect until a system reset or reboot has occurred This action validates the new settings From this screen specify the IP address of the remote media converter to which the connection is being made The TCP port number is a number from 1024 to 65535 NOTE Local and remote media converters must have the same port number in order for a connecti
14. en designed to give easy at a glance network status and provides real time connectivity information Please see below for an interpretation of their functions LED Indicators ion Status On Green Converter is receiving power Power off or failure Er Illuminated when connectors On Green are attached and link signals received Green port Off No link established RJ 45 port in 100Base On Green 100 moue Port is operating at full Off duplex On Green RS 232 422 485 data ACT Flashing packets being transmitted or received No data packets received On Green Indicates normal operation Converter is off line 18 RS 232 422 485 to 10 100Base TX Converter 5 Configuration There are two separate methods for configuring this media converter for use In the first section of this chapter the Command line Interface CLI or Menu driven interface via the Console Port to set the device for connection to data terminal equipment in console mode will be defined The second section will describe CLI or Menu driven via Telnet configuration Firstly make the connection below RS 232 Cable Converter al ont gt zil Male Female Computer DIP Switch 1 set to ON position RS 232 wiring please see Appendix A Console Port The Converter is accessible via a terminal emulator attached to the RS 232 console port After completing the steps outlined to connect the devices see Connec
15. er into an available socket 3 Check the rear panel LEDs as the device is powered on to verify that the Power LED is lit If not check that the power cable is correctly and securely plugged in Note For International use you may need to change the AC power adapter cord You must use a power cord set that has been approved for the receptacle type and electrical current in your country RS 232 422 485 to 10 100Base TX Converter Connecting Copper Cable The 10 100BASE TX RJ 45 Ethernet port fully supports auto sensing and auto negotiation 1 Insert one end of Category 5 twisted pair cable into an available RJ 45 port on the Converter and the other end into the port of the network node 2 Check the corresponding port LED on the Converter to make sure that the connection is valid Refer to LED chart in next section RS 232 422 485 to 10 100Base TX Converter DB9 Female Connector Pin Assignments oOo N cC C N RS 422 485 RS 485 4 wire 2 wire Signal Full Half Direction duplex duplex DATA B RS 232 Full duplex DATA A NOTE Bi directional RS 485 BUS line 13 RS 232 422 485 to 10 100Base TX Converter Serial Connection This Converter features DIP switches on the rear panel that sets the unit to the correct type of cable configuration to Support connection with a RS 232 422 485 device Definition of DIP Switches No Dip description _ 1 Defaut
16. mands list ping Type ping followed by a space and then the IP address of the device to send a test signal If a response is received then the device is connected To view a full list of ping options type ping and press ENTER reset reset config and press ENTER to load factory default settings or type reset system and press ENTER to restart the system show show to display a full list of view commands set To configure the management console type the commands below followed by the ENTER key 35 RS 232 422 485 to 10 100Base TX Converter NOTE Separate each port of the command line with a space set admin follow the prompts to change user name and password set cfg the command is for factory setting use set ethO ip new IP address network mask new network mask gateway new gateway Use this command to set new addresses set idle time in seconds set automatic logout when the program or communication is idle set xfer the command is for RS232 configuration and data communication setting The command syntax is as below set xfer arg 1 data 1 arg 2 data 2 arg n data n Argument List set idle time of serial port remote Set remote IP address scene oet TCP port number baud oet baud rate of serial port parity oet parity of serial port length Set word length of serial port stopbits oet stop bits of seri
17. nd Line Interface Telnet 32 Remote Computer Login 33 Command Definitions 35 38 R232 WINN est 38 Ho 422 495 WIRING erisso e a 40 Appendix B me 42 About RJ 45 O3bl68 inncan 42 ADDenOIX C cupide utes rust i 43 Rear view of Chassis and specifications 46 D PP E 47 ADpliCauorn DIAG TAM seccion 47 RS 232 422 485 to 10 100Base TX Converter 1 Introduction About This Guide Welcome Thank you for selecting the RS 232 422 485 to 10 100Base TX media converter This unit is designed to provide a RS 232 422 485 point to point connection over twisted pair cable where the connected devices have RS 232 422 485 interfaces Enabling serial devices such as and PLCs to instantly connect to an existing Ethernet Fast Ethernet network the Serial to Ethernet media converter represents a robust solution for devices controllers or MIS personnel Purpose This guide discusses how to install and configure your RS 232 422 485 to 10 100Base T X Converter Terms Usage In this guide the term Converter first letter upper case refers to your RS 232 422 485 to 10 100Base TX Converter and converter first letter lower case refers to other converters RS 232 422 485 to 10 100Base TX Converter Features e Complies with EIA TIA and IEEE standa
18. on The Connection Idle Time field becomes active when there is no traffic passing through the media converter Set the idle time value between 30 and 3600 seconds When this time limit has been reached the connection will be terminated automatically Under the Serial Port Configuration heading the field Operation Mode is a read only value indicating one of the following modes Console RS 232 RS 422 RS 485 The mode is based on the DIP switches setting found on the rear panel of the media converter 27 RS 232 422 485 to 10 100Base TX Converter Other fields that can be modified from this screen are communication data baud rate parity word length stops bits and flow control Defaults for these are below e Baud rate 38400 e Parity N e Word length 8 e Stop bits 1 e Flow control none 28 RS 232 422 485 to 10 100Base TX Converter Monitor Menu This screen provides at a glance system status information Monitor Menu 29 RS 232 422 485 to 10 100Base TX Converter TFTP Firmware Upgrade Menu From this menu the user can upgrade the existing firmware to newer firmware available from a TFTP server Simply enter the file name of the updated firmware in the file name field and enter the IP address of the TFTP server in the IP address field to perform the upgrade TFTP Firmware Upgrade menu 30 RS 232 422 485 to 10 100Base TX Converter Load Sy
19. rds e Supports 4 wires full duplex asynchronous serial data transmission RS 422 485 e Supports 2 wires half duplex asynchronous serial data transmission RS 485 e Supports serial port asynchronous data rates up to 115 2 Kops e Extended distances up to 1 2 km 24 AWG using RS 422 485 e Auto detecting 10 100 Mbps Ethernet interface Terminator feature improves signal quality and distance LEDs for at a glance device status Stand alone or chassis installation External power supply FCC Class A amp CE approved RS 232 422 485 to 10 100Base TX Converter Specifications Standards IEEE 802 3 10BASE T Ethernet IEEE 802 3u 100BASE TX Fast Ethernet EIA TIA RS 232 EIA TIA 5 4 Ports 1x UTP 100 1200hm RJ 45 type 1x 9 pin serial connector D sub female Max Distance UTP 100 meters Cat 3 4 5 Serial 15 meters RS 232 1 200 meters RS 422 RS 485 Data Rates UTP 10 or 100 Mbps Serial 50 115 2 kbps asynchronous Signals RS 232 TxD RxD CTS RTS DTR DSR RI DCD GND RS 422 TxD RxD GND RS 485 Data Data GND Configuration Parity None even odd Data bits 7 8 Stop bits 1 2 only None parity Switches Power Environment RS 232 422 485 to 10 100Base TX Converter DIP 1 Enables disables console data communication mode DIP 2 Enables disables RS 232 DIP 3 Enables disables RS 422 485 4 wire DIP 4 Enables disables RS 485 2 wire
20. stem Default The Load System Default command allows a user to restore factory default settings to the converter From the Main Menu highlight the Load System Default field and hit the ENTER key to execute System Restart The System Restart allows a user to perform a warm restart and validate newly saved configuration to the media converter From the Main Menu highlight the system Restart field and hit the ENTER key to reset the unit Warning After each configuration session be sure to set DIP switch 1 to the OFF position Otherwise the converter will not transmit any data 31 RS 232 422 485 to 10 100Base TX Converter Command Line Interface Telnet The Converter is accessible via a remote computer using Telnet After completing the steps outlined to connect the devices see Connection to Data Terminal Equipment in previous chapter proceed with the directions below to login to the management facility using a remote computer The Converter is preset with a factory IP address that must be configured to the user s individual IP address It is important to do this so that the converter doesn t conflict with other devices with the same defaults NOTE Prior to following the instructions listed below for Remote Computer Login ensure that a serial cable connection between the media converter and remote workstation exists 32 RS 232 422 485 to 10 100Base TX Converter Remote Computer Login 1
21. tion to Data Terminal Equipment in previous chapter proceed with the directions below to login to the management facility using a HyperTerminal The 19 RS 232 422 485 to 10 100Base TX Converter Converter is preset with a factory IP address 192 168 0 254 that must be configured to the user s individual IP address It is important to do this so that the converter doesn t conflict with other devices with the same defaults NOTE Prior to following the instructions listed below for HyperTerminal Configuration ensure that a serial cable connection between the media converter and remote workstation exists ki ub rm Configuration The default Login name is admin with no preset password After successful login type the following command line to change the device IP address in CLI mode where xxx s represent values between 0 and 254 and the user should enter their own IP address in this form e Set ethO Ip XXX XXX XXX XXX 2 After entering the new IP address The system will confirm whether the operation is successful NOTE Copy the new address down on a piece of paper You will need the address when you are going to use Telnet or set up data transfer communication connection Warning IP addresses are unique If an address isn t available please contact the appropriate authorities to apply for one 20 RS 232 422 485 to 10 100Base TX Converter 3 After you log into the system you will see a
22. ult setting is OFF 7 Dip switch 7 only support RS 422 485 mode please according to your network configuration to set up the switch Dip default is off RS 232 422 485 to 10 100Base TX Converter Connection to Data Communication Equipment DCE 1 Ensure that DIP switch 1 is in the OFF position Disables Console mode 2 Set DIP switches 2 3 and 4 according to wire type as indicated below DIP2 DIPS DPA 4 wire RS 422 485 2 wire RS 485 3 Prepare TIA EIA 574 422 485 compliant Straight through shielded cables with DB 9 connectors Please refer to the appendix for more information 4 Connect male DB 9 connector at one end of cable to converter s female DB 9 connector 5 Connect male or female DB 9 connector at other end of cable to DCE s male or female DB 9 connector RS 232 422 485 to 10 100Base TX Converter Ethernet Connection The Converter is equipped with an auto sensing auto negotiation RJ 45 Ethernet port Simply insert one end of a Category 3 4 5 5e type twisted pair cable into the Converter s RJ 45 port and the other end into a hub switch or computer s Ethernet card NOTE The RJ 45 port accepts both straight through and cross over Ethernet cables without the need to re configure the port 17 RS 232 422 485 to 10 100Base TX Converter 4 LED Indicators This Converter has LED indicators located at the front of the device The LEDs have be
23. ve Secure the brackets by replacing the screws 44 RS 232 422 485 to 10 100Base TX Converter Ensure that the rails are flush mounted with the underside of the converter The converter is now ready for loading into the Chassis Installing the Converter Once the Converter has been attached to the bracket can be installed into the Chassis Special care must be taken to ensure the correct mating of the power connector Align the converter so that it fits between the upper and lower guide rails Warning Always ensure that the converter power socket is positioned at the base of the Chassis Never force the Converter into the Chassis check power socket position and alignment 45 RS 232 422 485 to 10 100Base TX Converter Rear view of Chassis and specifications Lies Rear View of Chassis with AC Power Supply Power 100 240V AC Optional 12V Adapter Dimensions 109 x 174 x 44 3 mm Lx W x H Power 48V DC Optional 12V Adapter Dimensions 109 x 174 x 44 3 mm Lx W x H 46 RS 232 422 485 to 10 100Base TX Converter Appendix D Application Diagram e DTF to PC CNC INTERNET INTRANET ETHERNET SWITCH ETHERNET SWITCH SEGMENT SEGMENT A SEGMENT A MEDIA CONVERTER SEGMENT A Serial cabling 1 200m max distance SEGMENT B Ethernet cabling Cat 3 4 5 5e 100m max distance e DTE to DCE PC
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